The Combined Risk Index is calculated by normalizing the values of the following columns:
Each column is normalized to a range between 0 and 1, where 0 represents the lowest risk and 1 represents the highest risk. The Combined Risk Index is the average of these normalized values.
Note that for the normalization:
In the Pacific context, these variables are crucial due to their direct impact on communities' vulnerability to natural disasters, accessibility, and overall resilience:
High risk sites are classified as follows:
The percentage of high-risk sites is calculated as the number of high-risk sites divided by the total number of sites.
| Province | Mean Rainfall in Driest Quarter (mm) | Median Rainfall in Driest Quarter (mm) | Std Dev Rainfall in Driest Quarter (mm) | Mean Height above Sea Level (m) | Median Height above Sea Level (m) | Std Dev Height above Sea Level (m) | Mean Height above Drainage Network (m) | Median Height above Drainage Network (m) | Std Dev Height above Drainage Network (m) | High Risk Sites (Rainfall) | High Risk Sites (Height above Sea Level) | High Risk Sites (Height above Drainage Network) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Western | 228 | 221 | 74 | 49 | 21 | 106 | 17 | 10 | 25 | 317 (100.0%) | 73 (23.0%) | 149 (47.0%) |
| Northern | 247 | 274 | 86 | 25 | 18 | 27 | 15 | 10 | 17 | 242 (100.0%) | 78 (32.0%) | 113 (47.0%) |
| Eastern | 260 | 304 | 135 | 20 | 13 | 22 | 17 | 9 | 21 | 127 (100.0%) | 49 (39.0%) | 64 (50.0%) |
| Central | 411 | 420 | 84 | 33 | 18 | 43 | 16 | 10 | 18 | 268 (100.0%) | 75 (28.0%) | 121 (45.0%) |
| Rotuma | 501 | 627 | 280 | 8 | 7 | 5 | 6 | 7 | 4 | 5 (100.0%) | 3 (60.0%) | 4 (80.0%) |
| National | 290 | 279 | 121 | 34 | 18 | 68 | 16 | 10 | 21 | 959 (100.0%) | 278 (29.0%) | 451 (47.0%) |